Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acd3fb44dfafb7d…

MALICIOUS

PDF

66.7 KB Created: 2021-03-20 18:27:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a2128f79c75a1e14d3cb9c1d0e03f6ba SHA-1: 55dec6f543a7f8f829e7018782cb492f3b36d899 SHA-256: 2acd3fb44dfafb7d531f486fbca17eb77015e4ee6a36e91d12c01d73596db361
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/123?utm_term=news+report+or+feature+article PDF link annotation
    • http://xofebuledat.scienceontheweb.net/lawelejibajodejab.pdfIn PDF document text
    • https://fugejifok.weebly.com/uploads/1/3/4/1/134132056/67219cc6.pdfIn PDF document text
    • http://spencermcman.us/what_does_pregnancy_symbolize26xo6.pdfIn PDF document text
    • https://vizisovi.weebly.com/uploads/1/3/4/1/134131984/288919.pdfIn PDF document text
    • https://gazekusiparisom.weebly.com/uploads/1/3/4/0/134012522/1581649.pdfIn PDF document text
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/c1ce41de11e7.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/factors_affecting_buffer_capacity.pdfIn PDF document text
    • https://zebilukirun.weebly.com/uploads/1/3/5/3/135306511/lavut.pdfIn PDF document text
    • http://topvideo.design/febevenexie2nhe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/marlin_336ss_30-30_review.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/blemish_remover_apk_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b519708-6e4b-48e5-ae96-a4c89494dddc/80387409080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413b61f4-39d1-4f38-abab-cfb5729b5298/robert_sepehr_species_with_amnesia.pdfIn PDF document text
    • http://sogoxutagejuno.atwebpages.com/2230021061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1521391-7693-40d8-9035-775704c09023/garmin_gns_650_xi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d060268-1809-4d76-a0b4-e659c987b628/47066244555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab54fc46-0921-4569-ba70-f926e3dd4937/56210089429.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/best_android_stock_app_reddit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 5072 bytes
SHA-256: 5afc693606c0efbe68232d9bfde3101b1e322fc009d9ea742452f8ea27f3d55a
font_01_sfnt_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 10584 bytes
SHA-256: 56e4cf7b67e5eafd5a05cb01c876b2973034f22d9cc34a167cf56cb257ab8891

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